All the reasons which made the initiation of physical force evil, make the retaliatory use of physical force a moral imperative.

Any group or "collective", large or small, is only a number of individuals. A group can have no rights other than the rights of its individual members.

There is nothing to take a man’s freedom away from him, save other men.

I can accept anything, except what seems to be the easiest for most people: the half-way, the almost, the just-about, the in-between.

Defiance, not obedience, is the American's answer to overbearing authority.

Look around you and look at history. You will see the achievements of man’s mind. You will see man’s unlimited potentiality for greatness, and the faculty that makes it possible. You will see that man is not a helpless monster by nature, but he becomes one when he discards that faculty: his mind. And if you ask me, what is greatness? I will answer, it is the capacity to live by the three fundamental values of John Galt: reason, purpose, self-esteem.

Errors of knowledge are not breaches of morality; no proper moral code can demand infallibility or omniscience.